Database accessing method and device and system

Abstract

The embodiment of the invention discloses a database accessing method. The method comprises the following steps of: receiving a modifying operation request of shared data of a database, wherein the shared data of the database is mapped to address space of a process; decomposing the modifying operation request into a predetermined number of atomic operation sequences; calling atomic operation interfaces according to an execution sequence of the atomic operation sequences; and accessing the shared data, which is mapped to the address space of the process, of the database through atomic operation provided by the atomic operation interfaces. Accordingly, the embodiment of the invention also discloses a database accessing device and a database application system. In the embodiment of the invention, the modifying operation is performed on the database through the technical scheme, the shared data of the database is accessed through atomic operation for processing, and the atomic operation is not interrupted by other processes during processing, so that consistency of the data can be guaranteed, and protection level of the shared data of the multi-process embedded concurrent accessed database is improved.

Description

Technical field [0001] The invention relates to the field of databases, in particular to a method, device and system for accessing a database. Background technique [0002] With the development of the telecommunications industry, the requirements for real-time and robustness of data storage are getting higher and higher. At the same time, the integration and access speed of hardware such as memory have been improved, and the cost has been reduced. This determines the role of memory databases in the telecommunications industry. Has become an increasingly important role. [0003] The traditional database management system adopts the C / S (client / server) access mode, which effectively isolates the application and the database system, and ensures the robustness of the system; however, additional network communication is generated under the C / S access mode (Usually TCP / IP) overhead limits the real-time performance of the database system, especially in high-speed memory databases, the ac...

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Problems solved by technology

[0004] While the embedded access method brings efficient access, it also has the following defects: when an application program exits abnormally for some reason when modifying the data in the memory database, this may cause the modification to not be completed (such as a certain half of a data structure is modified or some internal mutex resources are not released), leaving the database in an inconsistent state, which prevents other applications from using the in-memory database again.

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